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From "Mikael Sitruk (Created) (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5129) book is inconsistent regarding disabling - major compaction
Date Thu, 05 Jan 2012 12:33:39 GMT
book is inconsistent regarding disabling - major compaction
-----------------------------------------------------------

                 Key: HBASE-5129
                 URL: https://issues.apache.org/jira/browse/HBASE-5129
             Project: HBase
          Issue Type: Bug
          Components: documentation
    Affects Versions: 0.90.1
            Reporter: Mikael Sitruk
            Priority: Minor


It seems that the book has some inconsistencies regarding the way to disable major compactions

According to the book in chapter 2.6.1.1. HBase Default Configuration

hbase.hregion.majorcompaction - The time (in miliseconds) between 'major' compactions of all
HStoreFiles in a region. Default: 1 day. Set to 0 to disable automated major compactions.
Default: 86400000 (http://hbase.apache.org/book.html#hbase_default_configurations)

According to the book at chapter 2.8.2.8. Managed Compactions
"A common administrative technique is to manage major compactions manually, rather than letting
HBase do it. By default, HConstants.MAJOR_COMPACTION_PERIOD is one day and major compactions
may kick in when you least desire it - especially on a busy system. To "turn off" automatic
major compactions set the value to Long.MAX_VALUE."

According to the code org.apache.hadoop.hbase.regionserver.Store.java, "0" is the right answer.


(affect all documentation from 0.90.1)

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